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= 2 x 225 : 30
= 450 : 30
= 15 cm
d1 = 30 cm
Dit : d2 ....?
Penyelesaian :
L=1/2.d1 * d2
225 = 1/2.30*d2
225 = 15 * d2
225 / 15 =d2
15 =d2
Jadi, diagonal lainnya adalah 15cm